Google Domains (beta) is a domain registration service. It's separate from G Suite, and currently available only for users in the United States.

To unlock your domain:

Go to domains.google.com. If you're not taken to the Google Domains console, click Manage your domains at the top right. If prompted, sign in using the account username and password you used to purchase your domain.

Click for the domain you want to unlock and scroll down to the Domain lock section.

Click Unlock domain.

Note: If you don't see your domain listed, you may be signed in to a different account. Learn more aboutswitching accounts.